Spring Boot中如何处理跨域问题呢?

SpringBoot跨域简介

SpringBoot解决跨域问题的方法

SpringBoot中解决跨域,可使用以下方法:
     实现WebMvcConfigurer接口然后重写addCorsMappings方法 

 
@Configuration
public class CorsConfig implements WebMvcConfigurer {

   @Override
   public void addCorsMappings(CorsRegistry registry) {
       registry.addMapping("/**")
              .allowedOrigins("*")
              .allowCredentials(true)
              .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS")
              .maxAge(3600);
  }
}

注意事项:
     我们还需定义一个filter
	  因为在一些有权限验证的地方
	  http请求---会先进入filter---然后再达到servlet进行拦截
	   所以我们还需将cors放入到filter,使其优先于权限拦截器

@Configuration
public class CorsConfig {

   @Bean
   public CorsFilter corsFilter() {
       CorsConfiguration corsConfiguration = new CorsConfiguration();
       corsConfiguration.addAllowedOrigin("*");
       corsConfiguration.addAllowedHeader("*");
       corsConfiguration.addAllowedMethod("*");
       corsConfiguration.setAllowCredentials(true);
       UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
       urlBasedCorsConfigurationSource.registerCorsConfiguration("/**", corsConfiguration);
       return new CorsFilter(urlBasedCorsConfigurationSource);
  }
}